[PATCH RFC v1 1/2] documentation/iommu: Add description of Hisilicon System MMU binding

Dave Martin
2014-06-06T11:07:11Z

On Fri, Jun 06, 2014 at 08:48:26AM +0200, Arnd Bergmann wrote:
> On Thursday 05 June 2014 21:37:09 Zhen Lei wrote:
>
> > +- smmu-masters : A list of phandles to device nodes representing bus
> > + masters for which the SMMU can provide a translation
> > + and their corresponding StreamIDs (see example below).
> >
>
> We're currently in the process of defining a generic binding for IOMMUs.
>
> While the smmu-masters property was copied from an existing binding,
> I think we will end up migrating away from that towards a common way
> to express those things, and we shouldn't add another one doing this
> in a nonstandard way. Please have a look at the latest discussion
> about the iommu binding using #iommu-cells and a reference from the
> master to the iommu and see if you can migrate your code to use that.

Thanks for making this point -- I was going to do so yesterday but then
hesitated due to uncertainty about whether this should really be a new
driver.

Either way, it would be very valuable at least to attempt to describe
the Hisilicon SMMU implemenation using the new proposals, since that is
a good test of how reusable the proposed generic binding actually is.

Cheers
---Dave